asoc: codecs: Add swr dmic codec

Add initial changes for supporting swr dmic
where each codec can support single mic recording
over soundwire port.

Change-Id: I0319bfb5c850d48b563f46d5dd77f21d4a83f029
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>

asoc/codecs/swr-dmic.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef _SWR_DMIC_H
+#define _SWR_DMIC_H
+
+#include <sound/soc.h>
+#include <sound/info.h>
+
+enum {
+	SWR_DMIC_HIFI_PORT = 0,
+	SWR_DMIC_LP_PORT,
+	SWR_DMIC_MAX_PORTS,
+};
+
+#endif /* _SWR_DMIC_H */